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W. P. FREEMAN.

DYNAMO ELECTRIC MACHINE.

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WARREN P. FREEMAN, OF NEW YORK, N. Y., ASSIGNOR TO WILLIAM F. JOBBINS, OF EAST ORANGE, NEW JERSEY.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 270,779, dated January 16, 1883.

Application filed August '7, 1882.

.To all whom it may concern:

Be it known that I, WARREN P. FREEMAN, a citizen of the United States, and a resident of New York city, New York, have invented certain Improvements in Dynamo Electric Machines, of which the following is a specification.

The main object of my invention is to so construct a dynamo-electric machine that it may be-used for generating either an intensity current or a quantity current, or both, as may be desired; and this object I attain by winding the armature and the field-magnets with fine and coarse wire, and providing devices whereby either or both may be thrown into circuit, as more fully described hereinafter. In the accompanying drawings, Figure 1 is a diagram showing the armature-circuits in perspective and separate from the field-magnets, which are on a smaller scale; Fig. 2, a transverse section of adouble-wound armature. It should be understood at the outset that, although I have shown in the drawings only one form of field-magnets, A A, Fig. 1, and armature, my invention is applicable to dynamo-electric machines of almost any construction.

Iteferring to the diagram Fig.1 for the sake of simplicity, only one tine-wire coil, 1, and one coarse-wire coil, 2, are shown, the terminals of the coil 1 being connected to the segments of the commutator D, while the terminals of the coil 2 are connected to the segments of the commutator D. The brushes E E, which bear on the commutator D, are connected by conductors 3 3 to the corresponding fine-wire coils of the field-magnets A A; and the brushes E E of the commutator D in like manner are connected by conductors 4 4. to the thick-wire coils of the field-magnets, and the four terminals of these field-magnet coils are connected to the four binding-stops a, so that the two (No model.)

independent circuits in the machine may be connected up into two independent external I circuits, or into one and the same external cir' cuit, as may be desired. For instance, where it may be desired to supply either a quantitycurrent or an intensity-current for the are or the incandescent systems of electric lighting,

.as maybe required, they can both be supplied from the one machine by connecting up the two independent external circuits; or where it is desired to have a circuit which may be supplied with an intensity or quantity current, or both at once, both machine-circuits may be connected up in one and the same external circuit, and by throwing either of the sets of brushes E or E out of contact with their commutators, or putting them both into cont-act with their commutators, a quantity or intensity ora united current maybe supplied at pleasure, according to the capacity of the machine.

The two sizes of wire may be wound on together, as shown in connection with the armature, Fig. 2, or one over the other, as shown in connection with the field-magnets in Fig. 1.

I claim as my invention- 1. A dynamo-electric machine having both the armature and field-magnets wound with coils of two difierent sizes of wire in two independent circuits for the production of currents of different intensity by the one machine, sub- 

